/* SpecialCoffee.ru Layout System
   Page chrome: header, mobile nav, footer, grids, section variants, FAB, skip-link.
   Depends on css/variables.css and css/base.css (must be loaded first). */

/* =============================================================================
   Section 1: Skip Navigation Link (A11Y-04)
   ============================================================================= */

/* Extends .visually-hidden from base.css (class applied in HTML alongside skip-link) */
.skip-link:focus-visible {
  position: fixed;
  top: var(--space-sm);
  left: var(--space-sm);
  z-index: 200;
  width: auto;
  height: auto;
  padding: var(--space-sm) var(--space-md);
  clip: auto;
  overflow: visible;
  white-space: normal;
  background-color: var(--color-red);
  color: var(--text-on-dark);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  text-decoration: none;
  /* outline handled by global :focus-visible in base.css */
}

/* =============================================================================
   Section 2: Header (LAY-01)
   ============================================================================= */

.header {
  position: sticky;
  top: 0;
  z-index: 150;
  width: 100%;
  height: var(--header-height);
  background-color: var(--color-cream);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.header-scrolled {
  background-color: var(--bg-dark);
  border-bottom-color: transparent;
  box-shadow: var(--shadow-md);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.header__logo {
  text-decoration: none;
  flex-shrink: 0;
}

.header__logo img {
  height: 40px;
  width: auto;
}

/* Hide CTA button on mobile, show on desktop */
.header__cta {
  display: none;
}

@media (min-width: 1024px) {
  .header__cta { display: block; }
}

/* =============================================================================
   Section 3: Desktop Navigation (LAY-01)
   ============================================================================= */

.header__nav {
  display: none; /* hidden on mobile */
}

@media (min-width: 1024px) {
  .header__nav { display: block; }
}

.nav__list {
  display: flex;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 0;
}

.nav__link {
  display: block;
  padding: var(--space-xs) var(--space-lg);
  color: var(--text-primary);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-regular);
  text-decoration: none;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.nav__link:hover {
  color: var(--color-red);
}

.nav__link.is-active {
  color: var(--color-red);
  font-weight: var(--font-weight-semibold);
}

/* Scrolled state overrides for text color */
.header-scrolled .nav__link {
  color: var(--text-on-dark);
}

.header-scrolled .nav__link:hover,
.header-scrolled .nav__link.is-active {
  color: var(--color-cream);
}

/* =============================================================================
   Section 4: Burger Button (LAY-02)
   ============================================================================= */

.burger-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast);
  border-radius: var(--radius-sm);
}

.burger-btn:hover {
  background-color: var(--color-latte);
}

.burger-btn:active {
  transform: scale(0.95);
}

.burger-btn svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: var(--text-primary);
  stroke-width: 2;
  stroke-linecap: round;
}

.header-scrolled .burger-btn svg {
  stroke: var(--text-on-dark);
}

.header-scrolled .burger-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

@media (min-width: 1024px) {
  .burger-btn { display: none; }
}

/* =============================================================================
   Section 5: Mobile Nav Overlay (LAY-02)
   ============================================================================= */

.nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 200;
  background-color: var(--bg-dark);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.nav-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.nav-overlay__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.nav-overlay__close:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-overlay__close svg {
  width: 24px;
  height: 24px;
  stroke: var(--text-on-dark);
  stroke-width: 2;
  stroke-linecap: round;
  fill: none;
}

.nav-overlay__list {
  list-style: none;
  padding: 0;
  margin: 0;
  text-align: center;
}

.nav-overlay__list li {
  margin-bottom: var(--space-lg);
}

.nav-overlay__link {
  color: var(--text-on-dark);
  font-size: var(--font-size-heading);
  font-family: 'Playfair Display', serif;
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav-overlay__link:hover {
  color: var(--color-cream);
}

@media (min-width: 1024px) {
  .nav-overlay { display: none; }
}

/* =============================================================================
   Section 6: Footer (LAY-03)
   ============================================================================= */

.footer {
  background-color: var(--bg-dark);
  color: var(--text-on-dark);
  padding-top: var(--space-3xl);
  padding-bottom: 0;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

@media (min-width: 768px) {
  .footer__inner {
    grid-template-columns: repeat(4, 1fr);
    padding: 0 var(--space-lg);
  }
}

.footer__title {
  font-family: 'Playfair Display', serif;
  font-size: var(--font-size-subheading);
  font-weight: var(--font-weight-semibold);
  color: var(--text-on-dark);
  margin-bottom: var(--space-md);
  line-height: var(--line-height-tight);
}

.footer__links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  row-gap: var(--space-sm);
}

.footer__link {
  color: var(--color-border);
  text-decoration: none;
  font-size: var(--font-size-body);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-cream);
}

.footer__text {
  color: var(--color-border);
  font-size: var(--font-size-small);
  line-height: var(--line-height-normal);
}

.footer__logo img {
  height: 32px;
  width: auto;
  margin-bottom: var(--space-sm);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-md) 0;
  margin-top: var(--space-3xl);
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

@media (min-width: 768px) {
  .footer__bottom {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }
}

.footer__copyright {
  color: var(--color-border);
  font-size: var(--font-size-small);
}

/* =============================================================================
   Section 7: Responsive Grids (LAY-04)
   ============================================================================= */

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* =============================================================================
   Section 8: Section Variants (LAY-05)
   ============================================================================= */

.hero-section {
  background-color: var(--bg-dark);
  background-image: linear-gradient(135deg, rgba(44, 24, 16, 0.95) 0%, rgba(44, 24, 16, 0.7) 100%);
  color: var(--text-on-dark);
}

.hero-section h1,
.hero-section h2,
.hero-section h3,
.hero-section p {
  color: var(--text-on-dark);
}

.section-light {
  background-color: var(--color-latte);
  color: var(--text-primary);
}

.section-dark {
  background-color: var(--bg-dark);
  color: var(--text-on-dark);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4,
.section-dark p,
.section-dark label {
  color: var(--text-on-dark);
}

/* =============================================================================
   Section 9: Floating Telegram Button (LAY-06)
   ============================================================================= */

.fab-telegram {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-telegram);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  z-index: 100;
  text-decoration: none;
  transition: filter var(--transition-fast), transform var(--transition-fast);
}

.fab-telegram:hover {
  filter: brightness(0.9);
  transform: scale(1.05);
}

.fab-telegram:active {
  transform: scale(0.97);
}

.fab-telegram svg {
  width: 24px;
  height: 24px;
  fill: var(--text-on-dark);
}